OTHER NON-CURRENT LIABILITIES (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Operating lease liabilities	$ 16,301	$ 28,800	$ 0
Income tax liabilities	6,980		7,069
Deferred revenue	85		19
Other non-current liabilities	406		2,090
Total	$ 23,772		$ 9,178